Cooling unit



May 2l', 1935.

H. A. GREENWALD COOLING UNIT Filed May 18, 1931 2 Sheets-Sheet 1 .olaf

` INVENTOR Hazwdcree/YWQZJ BY I ATToRNl-:Ys

May 21, l935.- H. A. GREENWALD 2,001,872

COOLING UNIT Filed May 18, 1931 2 sheets-sheet 2 INVEN'roR /ra Z cZ/reenwa ATTORNEYS Patented May 2l, 1.935

UNITED STATES PATENT ori-ICE mcsne assignments, to Kelvinator Corporation, IDctToit, Mich., a corporation of Michigan Application May 18, 1931, Serial No. 538,335

6 Claims.

'I'his invention relates generally to cooling units for refrigeratng apparatus `and consists oi' certain novel features of construction, combinations and arrangements of parts that will be hereinafter more fully described and particularly A tromotive series.

pointed out in the appended claims.

Heretofore in the construction of cooling units metal such as aluminum has been cast about copper tubing to form the body of the cooling unit. However, it has been found that the combination of aluminum and copper is objectionable. `For example, the tendency of one metal to have electrolytic action with another as a general rule depends upon how far apart they are in the electromotive series. The farther apart they are the more rapid is the velectrolytic action. Moreover, metals are chemically active and corrode in the order of their position in the elec- Aluminum and copper are quite far apart in the electromotive series, consequently when aluminum is cast upon copper tubing to form a cooling unit which is subjectA to moisture conditions electrolytic action is set up and corrosion will take place.

In the present instance I employ steel tubing in aluminum and the latter is so shaped that cores are eliminated. Moreover, in the construction of cooling units, I have found that it is better to have steel or iron cast in the aluminum because the aluminum and steel are closer together. than aluminum and copper in the electromotive series and the chemical action .between such metals is slower when subjectedvto moisture. In addition the steel is preferable as the cost thereof is less than that of the copper.

In the accompanying drawings:

Figure 1 is a front elevation of a cooling unit embodying my invention;

Figure 2 is a side elevation of the unit;

Figure 3 is a bottom plan view of one section of the unit;

Figure 4 is a horizontal sectional view throng one section of the unit; Figure 5 is a front elevation of a slightly modied construction.

Referring now to the drawings, A is a cast -metal body, and B and C respectively are refrigerant expansion coils of a cooling unit embodying my invention. As shown, the body A is substantially square shape in cross section and comprisestwo complementary'sections 1 and 2 respectively that are bolted togetherat the top and -bottom thereof. In the present instance the sections I and 2 are castings and are preferably formed of aluminumm or commercial aluminum alloy. Substantially parallel fins 3 extend longitudinally of and project radially from the top, side and bottom walls 4, 6 and 6 respectively of -each section while substantially hori- `zontal ribs 1 project inwardly from the side walls 5 of the sections and constitute shelves for supporting ice trays and the like. The coils B and C are preferably formed of steel tubing and are embedded in the side walls 5 of the aluminum body.4 Preferably the `coils have substantially `straight portions 8 projecting through the rear walls 9 of the sections and connected by a short length III of tubing, and have other straight portions I I that terminate immediately in rear of threaded openings I 2 in the side walls 5 of the sections. An expansion valve I2 is adapted to be secured in one threaded opening I2 while an elbow I2" is adapted to be secured in the other opening I2 and is connected to the return line Il to the compressor. In use the unit may be mounted in the refrigerating chamber of a cabinet so that the aluminum body may absorb the heat within the cabinet and transmit it to the steel tubing of thecoils where `it is carried by the refrigerant therein back to the compressor of the apparatus. Consequently the maxim eillciency is obtained.

In Figure 5 I have illustrated a slight modiiication wherein the sections I5 and I6 of the cooling unit are entirely devoid of ribs such as I and are bolted together so that the joint between the two is in a horizontal plane. With this construction a plate I'I is clamped between the opposed edges of the sections and constitutes a shelf for supporting an ice trayor the like.

While it is believed that from the foregoing description the nature and advantages of the invention will be readily apparent, I desire to have it understood that I do not limit myself to what is herein shown and described and that such changes may be resorted to when desired as fall within the scope of what is claimed. v

What I claim as my invention is: Y

1. A cooling unit having a body formed of com plementary sections, each section having a threaded opening, and refrigerant expansion coils embedded in said sections, one in each section, one end of each coil being adjacent and communicating with a threaded opening, and the other end of each coil projecting through a, wall of the section, and a separable connecting member between the last mentioned projecting end portions of said coils, said connecting member be-V ing so constructed and arranged as to both join the coils and clamp the sections together.

2. A cooling unit having a body portion comprising two similar sections secured together to provide top, bottom and side walls of a freezing zone, a spiral refrigerant coil embedded in said side wall formed by one of said sections, a spiral refrigerant coil embedded in the side wall formed by the other section, said coils extending over relatively large portions of said side walls, and an independent connection between said coils.

3. A cooling unit having'a body portion comprising two similar sections secured together to provide top, bottom and side walls of a freezing zone, means secured to said sections to provide a rear Wall'of said freezing zone, coiled refrigerant conduits embedded in walls formed by said sections and having substantially straight portions extending through said means, and a connection between said portions for circulating refrigerant from one conduit to another.

4. A cooling unit having a body portion comprising complementary sections secured together. to provide walls of a freezing zone, a member secured to said sections to provide a rear wall of said zone, coiled refrigerant conduits embedded in walls formed by said sections and having substantially straight portions extending from said walls through said member, and a connection between said portions for circulating refrigerant from one conduit to another.

5. A cooling unit having a body portion comprising complementary sections to provide walls of a freezing zone, a member secured to said sections to provide an additional wall of said freezing zone, coiled refrigerant conduits embedded in walls formed by said sections and having end portions extending through said member, and a connection between said portions for circulating refrigerant from one conduit to another.

6. A cooling unit having a body comprising two Acomplementary i2-shaped sections secured together adjacent the top and bottom to provide a freezing zone, a refrigerant evaporating coil embedded in a side wall of said zone formed by one of said sections, a refrigerant evaporating coil embedded in the opposite side wall of said zone formed by the other section, and an independent connection between said coils.

HAROLD A. GREENWALD. 

